Wordnet 3.0
ADJECTIVE (1)
1. 
 of or relating to apnea; 
[syn: apneic, apnoeic]
The Collaborative International Dictionary of English v.0.48:
apneic \apneic\ adj.
   1. 1 of or pertaining to apnea.
   Syn: apnoeic
        [WordNet 1.5]
WordNet (r) 3.0 (2006):
apneic
    adj 1: of or relating to apnea [syn: apneic, apnoeic]